x1, y1, x2, y2 = map(float,input().split())
a=((x1 - x2) ** 2 + (y1 - y2) ** 2) ** 0.5
print(a) x1, y1, x2, y2 = map(float,input().split()) x1 map(float,input().split()) map float input().split() ().split () input split y1 x2 y2 a=((x1 - x2) ** 2 + (y1 - y2) ** 2) ** 0.5 a ((x1 - x2) ** 2 + (y1 - y2) ** 2) ** 0.5 (x1 - x2) ** 2 + (y1 - y2) ** 2 (x1 - x2) ** 2 x1 - x2 x1 x2 2 (y1 - y2) ** 2 y1 - y2 y1 y2 2 0.5 print(a) print a x2, y2 = map(float,input().split()) map(float,input().split()) x2 x1, y1, x2, y2 = map(float,input().split()) map(float,input().split()) x1 a=((x1 - x2) ** 2 + (y1 - y2) ** 2) ** 0.5 ((x1 - x2) ** 2 + (y1 - y2) ** 2) ** 0.5 a y2 = map(float,input().split()) map(float,input().split()) y2 y1, x2, y2 = map(float,input().split()) map(float,input().split()) y1
x1, y1, x2, y2 = map(float,input().split())
a=((x1 - x2) ** 2 + (y1 - y2) ** 2) ** 0.5
print(a)
